US20170296175A1 - Medical staple - Google Patents
Medical staple Download PDFInfo
- Publication number
- US20170296175A1 US20170296175A1 US15/588,046 US201715588046A US2017296175A1 US 20170296175 A1 US20170296175 A1 US 20170296175A1 US 201715588046 A US201715588046 A US 201715588046A US 2017296175 A1 US2017296175 A1 US 2017296175A1
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- United States
- Prior art keywords
- bending position
- base
- needle portion
- bending
- needle
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/068—Surgical staplers, e.g. containing multiple staples or clamps
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/064—Surgical staples, i.e. penetrating the tissue
- A61B17/0644—Surgical staples, i.e. penetrating the tissue penetrating the tissue, deformable to closed position
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/068—Surgical staplers, e.g. containing multiple staples or clamps
- A61B17/0682—Surgical staplers, e.g. containing multiple staples or clamps for applying U-shaped staples or clamps, e.g. without a forming anvil
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/064—Surgical staples, i.e. penetrating the tissue
- A61B2017/0647—Surgical staples, i.e. penetrating the tissue having one single leg, e.g. tacks
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/068—Surgical staplers, e.g. containing multiple staples or clamps
- A61B17/072—Surgical staplers, e.g. containing multiple staples or clamps for applying a row of staples in a single action, e.g. the staples being applied simultaneously
- A61B2017/07214—Stapler heads
- A61B2017/07221—Stapler heads curved
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/068—Surgical staplers, e.g. containing multiple staples or clamps
- A61B17/072—Surgical staplers, e.g. containing multiple staples or clamps for applying a row of staples in a single action, e.g. the staples being applied simultaneously
- A61B2017/07214—Stapler heads
- A61B2017/07257—Stapler heads characterised by its anvil
- A61B2017/07264—Stapler heads characterised by its anvil characterised by its staple forming cavities, e.g. geometry or material
Definitions
- the present invention relates to a medical staple.
- Patent Literatures 1 and 2 have been used to suture pieces of biological tissue together (for example, see Patent Literatures 1 and 2).
- Staples to be employed as needles for the stapler exist in various shapes, so that it is possible to select ones that are suitable for the shape of biological tissue to be sutured, and so that it is possible to stably cause bending deformation in the staples to bend them into desired shapes.
- Patent Literature 1 discloses a general U-shaped staple
- Patent Literature 2 discloses a C-shaped staple.
- An object of the present invention is to provide a medical staple with which it is possible to stably cause bending deformation into a predetermined shape by means of a small amount of force.
- An aspect of the present invention is a medical staple including a rectangular base portion; and a needle portion that extends from one end of the base portion in a substantially arc shape so as to protrude in a predetermined direction with respect to the base portion, wherein the needle portion has a first bending position that is provided between a base connected at the one end and a distal end, and that yields first when a pressing force in a radially inward direction of a substantially arc shape of the needle portion acts on the distal end, and a second bending position that is provided between the first bending position and the base, and that yields first when the pressing force acts in the vicinity of the base of the first bending position.
- FIG. 1A shows a plan view, viewed from a needle-portion side according to an embodiment of the present invention.
- FIG. 1B shows a front view showing an overall configuration of a medical staple according to an embodiment of the present invention.
- FIG. 2A shows cross-sectional views taken along a first bending position of a needle portion provided in the medical staple in FIGS. 1A and 1B .
- FIG. 2B shows cross-sectional views taken along a second bending position of a needle portion provided in the medical staple in FIGS. 1A and 1B .
- FIG. 2C shows cross-sectional views taken along a base of a needle portion provided in the medical staple in FIGS. 1A and 1B .
- FIG. 3A shows front views of the medical staple in FIG. 1B bent at the first bending position and.
- FIG. 3B shows front views of the medical staple in FIG. 1B bent at the second bending position.
- FIG. 4A is a diagram showing in the process of suturing biological tissue by using the medical staple in FIG. 1B .
- FIG. 4B is a diagram showing in the process of suturing biological tissue by using the medical staple in FIG. 1B .
- FIG. 4C is a diagram showing, in the process of suturing biological tissue by using the medical staple in FIG. 1B .
- FIG. 4D is a diagram showing, in changes in the amount of force required to cause bending deformation in the medical staple.
- FIG. 5A shows a plan view, viewed from a needle-portion side showing a modification of the medical staple in FIG. 1A .
- FIG. 5B shows a front view showing a modification of the medical staple in FIG. 1B .
- FIG. 5C shows a left side view, showing a modification of the medical staple in FIG. 1A and 1B .
- FIG. 6A shows a front view showing another modification of the medical staple in FIG. 1B .
- FIG. 6B shows a front view showing a state in which the staple of 6 A is bent at the first bending position and the second bending position.
- FIG. 7 is a front view showing another modification of the medical staple in FIG. 1B .
- FIG. 8 is a front view showing another modification of the medical staple in FIG. 1B .
- a medical staple 1 according to an embodiment of the present invention will be described below with reference to the drawings.
- the medical staple according to this embodiment is provided with a rectangular base portion 2 and a single needle portion 3 that extends from one end of the base portion 2 .
- the base portion 2 and the needle portion 3 are formed of a highly biocompatible metal, such as a titanium alloy, stainless steel, or the like.
- the needle portion 3 protrudes in a predetermined direction with respect to the base portion 2 , and is arc-shaped in which the center angle thereof is substantially 90° or less than 90°.
- the needle portion 3 protrudes from one end of the base portion 2 in a longitudinal direction thereof, extends toward the other end of the base portion 2 by protruding in a direction that intersects the longitudinal direction of the base portion 2 , and has a distal end 3 d as a free end.
- An outer-circumferential surface of the needle portion 3 that is positioned radially outside is curved at a constant curvature.
- a direction in FIG. 1B , a direction perpendicular to the plane of the figure perpendicular to a plane defined by the base portion 2 and the needle portion 3 (in FIG. 1B , the same plane as the plane of the figure) is defined as the width direction of the needle portion 3
- a radial direction of the arc shape of the needle portion 3 is defined as the thickness direction of the needle portion 3 .
- the needle portion 3 is formed of, sequentially from the base portion 2 , a curved portion 3 B and a distal-end portion 3 A that has the sharp distal end 3 d .
- the curved portion 3 B has a constant width W
- the distal-end portion 3 A has a width that gradually decreases toward the distal end 3 d .
- the needle portion 3 has thicknesses Tc, Tb, and Ta that gradually decrease from a base 3 c , which is connected at the base portion 2 , toward the distal end 3 d (i.e., Tc>Tb>Ta). Accordingly, as shown in FIGS.
- FIG. 2A shows the cross section at a first bending position 3 a , which is a boundary between the distal-end portion 3 A and the curved portion 3 B;
- FIG. 2B shows the cross section at a second bending position 3 b , which is an intermediate position in the curved portion 3 B;
- FIG. 2C shows the cross section at the base 3 c .
- the distal-end portion 3 A is configured so as to easily pierce or pass through biological tissue.
- the needle portion 3 is designed so as to yield first at the first bending position 3 a and to be bent about an axis in the width direction when a pressing force F 1 in a radially inward direction of the arc shape of the needle portion 3 acts on the distal end 3 d , thus increasing the pressing force F 1 .
- the needle portion 3 is designed so as to yield first at the second bending position 3 b and to be bent about an axis in the width direction when a pressing force F 2 in a radially inward direction of the arc shape of the needle portion 3 acts in the vicinity of the base of the first bending position 3 a , thus increasing the pressing force F 2 .
- the bending deformation that can occur in the needle portion 3 when a pressing force acts on the needle portion 3 can be divided into bending deformation about an axis in the thickness direction (X-axis) and bending deformation about an axis in the width direction (Y-axis), and the difficulty involved in causing the bending deformation about the respective axes depends on the cross-sectional shapes.
- a cross-sectional second-order moment Ix about the X-axis and a cross-sectional second-order moment Iy about the Y-axis are defined by the expressions below:
- Ix ( 1 / 12 )*thickness*(width) ⁇ 3 , and
- Iy ( 1 / 12 )*(thickness) ⁇ 3 *width.
- the magnitudes of the bending moments about the Y-axis in the width direction that act at the respective positions of the needle portion 3 depend on the distances between these positions and the positions at which the pressing forces F 1 and F 2 are acting and the angles formed between the thickness directions at these positions and the directions in which the pressing forces F 1 and F 2 are acting.
- the shape of the needle portion 3 is designed so that the first bending position 3 a yields first to the bending moment when the pressing force Fl acts on the distal end 3 d .
- the shape of the needle portion 3 is designed so that the second bending position 3 b between the base 3 c and the first bending position 3 a yields first to the bending moment when the pressing force F 2 acts in the vicinity of the base of the first bending position 3 a.
- the thickness Tb and the width W of the cross-sectional shape are the same at the second bending position 3 b , and, as shown in FIG. 2C , the width W is greater than the thickness at a position that is closer to the distal end 3 d than the second bending position 3 b is.
- the cross-sectional second-order moment about the Y-axis is equal to or less than the cross-sectional second-order moment about the axis in the other direction, and thus, in the portion between the second bending position 3 b and the distal end 3 d , in which the cross-sectional area is relatively small in the needle portion 3 , it is particularly difficult to cause bending deformation about the X-axis, as compared with that about the Y-axis.
- a length L 1 between the distal end 3 d and the first bending position 3 a in a circumferential direction is smaller than a length L 2 between the second bending position 3 b and the base in a circumferential direction.
- the medical staples 1 according to this embodiment are used as needles for a medical stapler provided with a cartridge 4 and an anvil 5 that can be opened and closed.
- the cartridge 4 and the anvil 5 have inner surfaces 4 a and 5 a that face each other and are configured so that biological tissue can be gripped between the inner surfaces 4 a and 5 a in a state in which the cartridge 4 and the anvil 5 are closed.
- Numerous slots 6 are provided in the inner surface 4 a of the cartridge 4 .
- the medical staples 1 are accommodated in the slots 6 so as to be protrudable from and retractable into the slots 6 in a state in which the distal ends 3 d face the inner surface 5 a of the anvil 5 .
- the cartridge 4 is provided, in a movable manner, with cams 7 for pushing out the medical staples 1 from the slots 6 .
- the base portions 2 of the medical staples 1 are pushed by inclined faces 7 a provided in the cams 7 sequentially from one ends thereof to base ends thereof, the medical staples 1 are pushed out from the slots 6 while being rotated along the arc shapes of the needle portions 3 , as shown in FIG. 4A .
- the needle portions 3 that are pushed out from the slots 6 while being rotated pass through biological tissue P from the cartridge 4 side in the thickness direction, and, subsequently, the distal ends 3 d come into contact with the inner surface 5 a of the anvil 5 . Then, the pressing force F 1 from the inner surface 5 a of the anvil 5 acts on the distal ends 3 d , and thus, the first bending positions 3 a begin to bend, as shown in FIG. 4B .
- the positions at which the needle portions 3 come into contact with the inner surface 5 a of the anvil 5 move along the outer-circumferential surfaces of the needle portions 3 from the distal ends 3 d toward the first bending positions 3 a , and, during this movement, the bend angles of the first bending positions 3 a are gradually increased.
- the positions at which the needle portions 3 come into contact with the inner surface 5 a of the anvil 5 move along the outer-circumferential surfaces of the needle portions 3 from the vicinity of the bases of the first bending positions 3 a toward the bases 3 c , and, during this movement, the bend angles of the second bending positions 3 b are gradually increased.
- the second bending positions 3 b begin to bend the distal ends 3 d move toward the cartridge 4 , and thus, the distal-end portions 3 A pierce the biological tissue P again from the anvil 5 side, as shown in FIG. 4C . By doing so, it is possible to stably suture the biological tissue at two positions.
- the distal ends 3 d do not come into contact with the cartridge 4 even if the bend angles of the second bending positions 3 b exceed 90°. Therefore, it is possible to bend the second bending positions 3 b until reaching a satisfactory angle so that the biological tissue P is tightly held between the base portions 2 and portions between the first bending positions 3 a and the second bending positions 3 b of the needle portions 3 , and thus, it is possible to more reliably suture the biological tissue P.
- deformation is caused by means of contact between the outer-circumferential surface of the arc shape of the needle portion 3 and the inner surface 5 a of the anvil 5 , it is possible to cause deformation by means of an amount of force that is smaller than the case of the staples in the related art.
- the outer-circumferential surface of the needle portion 3 has the constant curvature, with an increase in the amount by which the needle portion 3 is pushed out from the cartridge 4 , the outer-circumferential surface of the needle portion 3 that comes into contact with the inner surface 5 a of the anvil 5 moves while smoothly being rotated with respect to the inner surface 5 a . By doing so, there is an advantage in that it is possible to further decrease the amount of force required to cause bending deformation in the needle portion 3 .
- the first bending position 3 a and the second bending position 3 b which preferentially yield to the pressing forces F 1 and F 2 applied thereto from the anvil 5 in the process of causing bending deformation by means of the anvil 5 , are set in the needle portion 3 .
- the pressing force that is subsequently applied to the needle portion 3 from the anvil 5 is consumed to cause additional bending deformation in the first bending position 3 a , and thus, deformation of portions other than the first bending position 3 a is prevented.
- the cross-sectional area of the needle portion 3 gradually increases from the distal end 3 d toward the base 3 c , it becomes increasingly difficult to cause bending deformation in the needle portion 3 in portions thereof that are closer to the base.
- the cross-sectional second-order moment about the Y-axis strongly depends on the thickness. Therefore, because the thickness gradually increases from the distal end 3 d toward the base 3 c , a portion that is closer to the base 3 c than the first bending position 3 a is stably endures the bending moment generated by the pressing force Fl when the pressing force F 1 acts on the distal end 3 d .
- a portion that is closer to the base 3 c than the second bending position 3 b is stably endures the bending moment generated by the pressing force F 2 when the pressing force F 2 acts in the vicinity of the base of the first bending position 3 a .
- the needle portion 3 possesses characteristics that make it difficult to cause bending deformation about the X-axis. Therefore, for example, even if bending moment about the X-axis acts on the needle portion 3 in such a way that the needle portion 3 is pushed out from the slot 6 in a slightly slanted manner instead of perpendicular to the inner surface 5 a of the anvil 5 or the like, the needle portion 3 stably endures the bending moment about the X-axis, and thus, the bending deformation thereof is selectively caused only about the Y-axis. By doing so, there is an advantage in that it is possible to further stabilize the bent shape of the needle portion 3 .
- the width of the needle portion 3 is constant from the base 3 c to the first bending position 3 a , the thickness of the needle portion 3 is smaller at the second bending position 3 b than it is at the base 3 c , and the thickness is smaller at the first bending position 3 a than it is at the second bending position 3 b .
- the medical staple 1 has been assumed to have a single needle portion 3 , alternatively, the medical staple 1 may be provided with two or more needle portions 3 , as shown in FIGS. 5A, 5B, and 5C .
- the medical staple 1 shown in FIGS. 5A, 5B, and 5C is provided with two needle portions 3 .
- the needle portions 3 protrude from two positions at one end of the base portion 2 with a space therebetween in the width direction, and extend so as to be parallel to each other.
- the two needle portions 3 may be provided at both ends of the base portion 2 .
- the two needle portions 3 protrude from both ends of the base portion 2 in opposing directions from each other in the longitudinal direction of the base portion 2 , and are curved in the same direction with respect to the base portion 2 .
- FIG. 6B it is possible to cause bending deformation in the needle portion 3 having such a shape, by using, for example, an anvil in which the inner surface 5 a thereof has a shape such as that shown in FIG. 6A .
- the needle portion 3 is assumed to have a shape in which the width and the thickness thereof continuously change from the distal end 3 d to the base 3 c , alternatively, the needle portion 3 may have a shape in which the width and the thickness thereof change in a step-wise manner, as shown in FIGS. 7 and 8 .
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Abstract
A medical staple is provided with: a rectangular base portion; and a needle portion that extends from one end of the base portion in a substantially arc shape so as to protrude in a predetermined direction with respect to the base portion, wherein the needle portion has a first bending position that is provided between a base connected at the one end and a distal end, and that yields first when a pressing force in a radially inward direction of an arc shape of the needle portion acts on the distal end, and a second bending position that is provided between the first bending position and the base, and that yields first when the pressing force acts in the vicinity of the base of the first bending position.
Description
- This is a continuation of International Application PCT/JP2014/079732, with an international filing date of Nov. 10, 2014, which is hereby incorporated by reference herein in its entirety. This application claims the benefit of International Application PCT/JP2014/079732.
- The present invention relates to a medical staple.
- In the related art, a stapler has been used to suture pieces of biological tissue together (for example, see
Patent Literatures 1 and 2). Staples to be employed as needles for the stapler exist in various shapes, so that it is possible to select ones that are suitable for the shape of biological tissue to be sutured, and so that it is possible to stably cause bending deformation in the staples to bend them into desired shapes. For example,Patent Literature 1 discloses a general U-shaped staple, whereasPatent Literature 2 discloses a C-shaped staple. - {PTL 2} Publication of U.S. Pat. No. 8,662,369, Specification
- An object of the present invention is to provide a medical staple with which it is possible to stably cause bending deformation into a predetermined shape by means of a small amount of force.
- An aspect of the present invention is a medical staple including a rectangular base portion; and a needle portion that extends from one end of the base portion in a substantially arc shape so as to protrude in a predetermined direction with respect to the base portion, wherein the needle portion has a first bending position that is provided between a base connected at the one end and a distal end, and that yields first when a pressing force in a radially inward direction of a substantially arc shape of the needle portion acts on the distal end, and a second bending position that is provided between the first bending position and the base, and that yields first when the pressing force acts in the vicinity of the base of the first bending position.
-
FIG. 1A shows a plan view, viewed from a needle-portion side according to an embodiment of the present invention. -
FIG. 1B shows a front view showing an overall configuration of a medical staple according to an embodiment of the present invention. -
FIG. 2A shows cross-sectional views taken along a first bending position of a needle portion provided in the medical staple inFIGS. 1A and 1B . -
FIG. 2B shows cross-sectional views taken along a second bending position of a needle portion provided in the medical staple inFIGS. 1A and 1B . -
FIG. 2C shows cross-sectional views taken along a base of a needle portion provided in the medical staple inFIGS. 1A and 1B . -
FIG. 3A shows front views of the medical staple inFIG. 1B bent at the first bending position and. -
FIG. 3B shows front views of the medical staple inFIG. 1B bent at the second bending position. -
FIG. 4A is a diagram showing in the process of suturing biological tissue by using the medical staple inFIG. 1B . -
FIG. 4B is a diagram showing in the process of suturing biological tissue by using the medical staple inFIG. 1B . -
FIG. 4C is a diagram showing, in the process of suturing biological tissue by using the medical staple inFIG. 1B . -
FIG. 4D is a diagram showing, in changes in the amount of force required to cause bending deformation in the medical staple. -
FIG. 5A shows a plan view, viewed from a needle-portion side showing a modification of the medical staple inFIG. 1A . -
FIG. 5B shows a front view showing a modification of the medical staple inFIG. 1B . -
FIG. 5C shows a left side view, showing a modification of the medical staple inFIG. 1A and 1B . -
FIG. 6A shows a front view showing another modification of the medical staple inFIG. 1B . -
FIG. 6B shows a front view showing a state in which the staple of 6A is bent at the first bending position and the second bending position. -
FIG. 7 is a front view showing another modification of the medical staple inFIG. 1B . -
FIG. 8 is a front view showing another modification of the medical staple inFIG. 1B . - A
medical staple 1 according to an embodiment of the present invention will be described below with reference to the drawings. - As shown in
FIGS. 1A and 1B , the medical staple according to this embodiment is provided with arectangular base portion 2 and asingle needle portion 3 that extends from one end of thebase portion 2. - The
base portion 2 and theneedle portion 3 are formed of a highly biocompatible metal, such as a titanium alloy, stainless steel, or the like. - The
needle portion 3 protrudes in a predetermined direction with respect to thebase portion 2, and is arc-shaped in which the center angle thereof is substantially 90° or less than 90°. In other words, theneedle portion 3 protrudes from one end of thebase portion 2 in a longitudinal direction thereof, extends toward the other end of thebase portion 2 by protruding in a direction that intersects the longitudinal direction of thebase portion 2, and has adistal end 3 d as a free end. An outer-circumferential surface of theneedle portion 3 that is positioned radially outside is curved at a constant curvature. - In the following, a direction (in
FIG. 1B , a direction perpendicular to the plane of the figure) perpendicular to a plane defined by thebase portion 2 and the needle portion 3 (inFIG. 1B , the same plane as the plane of the figure) is defined as the width direction of theneedle portion 3, and a radial direction of the arc shape of theneedle portion 3 is defined as the thickness direction of theneedle portion 3. - The
needle portion 3 is formed of, sequentially from thebase portion 2, acurved portion 3B and a distal-end portion 3A that has the sharpdistal end 3 d. Thecurved portion 3B has a constant width W, and the distal-end portion 3A has a width that gradually decreases toward thedistal end 3 d. In addition, theneedle portion 3 has thicknesses Tc, Tb, and Ta that gradually decrease from abase 3 c, which is connected at thebase portion 2, toward thedistal end 3 d (i.e., Tc>Tb>Ta). Accordingly, as shown inFIGS. 2A, 2B, and 2C , the substantially rectangular cross-sectional area of theneedle portion 3 in the thickness direction thereof gradually decreases from thebase 3 c toward thedistal end 3 d.FIG. 2A shows the cross section at afirst bending position 3 a, which is a boundary between the distal-end portion 3A and thecurved portion 3B;FIG. 2B shows the cross section at asecond bending position 3 b, which is an intermediate position in thecurved portion 3B; andFIG. 2C shows the cross section at thebase 3 c. In addition, by forming the distal-end portion 3 A in a shape in which the diameter thereof gradually decreases toward the sharpdistal end 3 d, the distal-end portion 3A is configured so as to easily pierce or pass through biological tissue. - As shown in
FIG. 3A , theneedle portion 3 is designed so as to yield first at thefirst bending position 3 a and to be bent about an axis in the width direction when a pressing force F1 in a radially inward direction of the arc shape of theneedle portion 3 acts on thedistal end 3 d, thus increasing the pressing force F1. Furthermore, as shown inFIG. 3B , theneedle portion 3 is designed so as to yield first at thesecond bending position 3 b and to be bent about an axis in the width direction when a pressing force F2 in a radially inward direction of the arc shape of theneedle portion 3 acts in the vicinity of the base of thefirst bending position 3 a, thus increasing the pressing force F2. - Here, bending-deformation characteristics of the
needle portion 3 will be described. - The bending deformation that can occur in the
needle portion 3 when a pressing force acts on theneedle portion 3 can be divided into bending deformation about an axis in the thickness direction (X-axis) and bending deformation about an axis in the width direction (Y-axis), and the difficulty involved in causing the bending deformation about the respective axes depends on the cross-sectional shapes. Specifically, a cross-sectional second-order moment Ix about the X-axis and a cross-sectional second-order moment Iy about the Y-axis are defined by the expressions below: -
Ix=(1/12)*thickness*(width)̂3, and -
Iy=(1/12)*(thickness)̂3*width. - When the pressing force F1 or F2 acts on the
distal end 3 d of theneedle portion 3 or in the vicinity of thebase 3 c of thefirst bending position 3 a thereof, the magnitudes of the bending moments about the Y-axis in the width direction that act at the respective positions of theneedle portion 3 depend on the distances between these positions and the positions at which the pressing forces F1 and F2 are acting and the angles formed between the thickness directions at these positions and the directions in which the pressing forces F1 and F2 are acting. - On the basis of such a relationship between the bending moment and the cross-sectional second-order moment, the shape of the
needle portion 3 is designed so that thefirst bending position 3 a yields first to the bending moment when the pressing force Fl acts on thedistal end 3 d. Similarly, the shape of theneedle portion 3 is designed so that thesecond bending position 3 b between thebase 3 c and thefirst bending position 3 a yields first to the bending moment when the pressing force F2 acts in the vicinity of the base of thefirst bending position 3 a. - As shown in
FIG. 2B , the thickness Tb and the width W of the cross-sectional shape are the same at thesecond bending position 3 b, and, as shown inFIG. 2C , the width W is greater than the thickness at a position that is closer to thedistal end 3 d than thesecond bending position 3 b is. In other words, at thefirst bending position 3 a and thesecond bending position 3 b, the cross-sectional second-order moment about the Y-axis is equal to or less than the cross-sectional second-order moment about the axis in the other direction, and thus, in the portion between thesecond bending position 3 b and thedistal end 3 d, in which the cross-sectional area is relatively small in theneedle portion 3, it is particularly difficult to cause bending deformation about the X-axis, as compared with that about the Y-axis. By doing so, it is easier to control the bending directions at thefirst bending position 3 a and thesecond bending position 3 b in the direction parallel to the plane, and thus, the bent shape of theneedle portion 3 is made more stable. A length L1 between thedistal end 3 d and thefirst bending position 3 a in a circumferential direction is smaller than a length L2 between thesecond bending position 3 b and the base in a circumferential direction. - Next, the operation of the thus-configured
medical staple 1 will be described. - The
medical staples 1 according to this embodiment are used as needles for a medical stapler provided with acartridge 4 and ananvil 5 that can be opened and closed. Thecartridge 4 and theanvil 5 haveinner surfaces inner surfaces cartridge 4 and theanvil 5 are closed. -
Numerous slots 6 are provided in theinner surface 4 a of thecartridge 4. Themedical staples 1 are accommodated in theslots 6 so as to be protrudable from and retractable into theslots 6 in a state in which the distal ends 3 d face theinner surface 5 a of theanvil 5. Thecartridge 4 is provided, in a movable manner, withcams 7 for pushing out themedical staples 1 from theslots 6. When thebase portions 2 of themedical staples 1 are pushed byinclined faces 7 a provided in thecams 7 sequentially from one ends thereof to base ends thereof, themedical staples 1 are pushed out from theslots 6 while being rotated along the arc shapes of theneedle portions 3, as shown inFIG. 4A . - The
needle portions 3 that are pushed out from theslots 6 while being rotated pass through biological tissue P from thecartridge 4 side in the thickness direction, and, subsequently, the distal ends 3 d come into contact with theinner surface 5 a of theanvil 5. Then, the pressing force F1 from theinner surface 5 a of theanvil 5 acts on the distal ends 3 d, and thus, thefirst bending positions 3 a begin to bend, as shown inFIG. 4B . With an increase in the amounts by which theneedle portions 3 are pushed out from theslots 6, the positions at which theneedle portions 3 come into contact with theinner surface 5 a of theanvil 5 move along the outer-circumferential surfaces of theneedle portions 3 from the distal ends 3 d toward thefirst bending positions 3 a, and, during this movement, the bend angles of thefirst bending positions 3 a are gradually increased. - When the positions at which the
needle portions 3 come into contact with theinner surface 5 a of theanvil 5 pass thefirst bending positions 3 a, bending deformation of thefirst bending positions 3 a is completed, and, next, the pressing force F2 from theinner surface 5 a acts in the vicinity of the bases of thefirst bending positions 3 a, and thus, thesecond bending positions 3 b begin to bend. With an increase in the amounts by which theneedle portions 3 are pushed out from theslots 6, the positions at which theneedle portions 3 come into contact with theinner surface 5 a of theanvil 5 move along the outer-circumferential surfaces of theneedle portions 3 from the vicinity of the bases of thefirst bending positions 3 a toward thebases 3 c, and, during this movement, the bend angles of thesecond bending positions 3 b are gradually increased. When thesecond bending positions 3 b begin to bend, the distal ends 3 d move toward thecartridge 4, and thus, the distal-end portions 3A pierce the biological tissue P again from theanvil 5 side, as shown inFIG. 4C . By doing so, it is possible to stably suture the biological tissue at two positions. - Because the lengths L1 between the distal ends 3 d and the
first bending positions 3 a of theneedle portions 3 are smaller than the lengths L2 between thesecond bending positions 3 b and thebases 3 c, the distal ends 3 d do not come into contact with thecartridge 4 even if the bend angles of thesecond bending positions 3 b exceed 90°. Therefore, it is possible to bend thesecond bending positions 3 b until reaching a satisfactory angle so that the biological tissue P is tightly held between thebase portions 2 and portions between thefirst bending positions 3 a and thesecond bending positions 3 b of theneedle portions 3, and thus, it is possible to more reliably suture the biological tissue P. - When the positions at which the
needle portions 3 come into contact with theinner surface 5 a of theanvil 5 pass thesecond bending positions 3 b, bending deformation of thesecond bending positions 3 b is completed, and, next, the pressing force from theinner surface 5 a acts between thesecond bending positions 3 b and thebases 3 c, and thus, portions between thesecond bending positions 3 b and thebases 3 c are bent. - As has been described above, with this embodiment, deformation is caused by means of contact between the outer-circumferential surface of the arc shape of the
needle portion 3 and theinner surface 5 a of theanvil 5, it is possible to cause deformation by means of an amount of force that is smaller than the case of the staples in the related art. In particular, because the outer-circumferential surface of theneedle portion 3 has the constant curvature, with an increase in the amount by which theneedle portion 3 is pushed out from thecartridge 4, the outer-circumferential surface of theneedle portion 3 that comes into contact with theinner surface 5 a of theanvil 5 moves while smoothly being rotated with respect to theinner surface 5 a. By doing so, there is an advantage in that it is possible to further decrease the amount of force required to cause bending deformation in theneedle portion 3. - The
first bending position 3 a and thesecond bending position 3 b, which preferentially yield to the pressing forces F1 and F2 applied thereto from theanvil 5 in the process of causing bending deformation by means of theanvil 5, are set in theneedle portion 3. After thefirst bending position 3 a is bent by yielding to the pressing force F1, because the bending rigidity of thefirst bending position 3 a is considerably decreased, the pressing force that is subsequently applied to theneedle portion 3 from theanvil 5 is consumed to cause additional bending deformation in thefirst bending position 3 a, and thus, deformation of portions other than thefirst bending position 3 a is prevented. Similarly, after thesecond bending position 3 b is bent by yielding to the pressing force F2, because the pressing force that is applied to theneedle portion 3 from theanvil 5 is consumed to cause additional bending deformation in thesecond bending position 3 b, deformation of portions other than thesecond bending position 3 b is prevented. As has been described above, because the bending positions of theneedle portion 3 are restricted to thefirst bending position 3 a and thesecond bending position 3 b, there is an advantage in that it is possible to form theneedle portion 3 into a predetermined bent shape by means of an even smaller amount of force. - As shown in
FIGS. 2A, 2B, and 2C , because the cross-sectional area of theneedle portion 3 gradually increases from thedistal end 3 d toward thebase 3 c, it becomes increasingly difficult to cause bending deformation in theneedle portion 3 in portions thereof that are closer to the base. In particular, the cross-sectional second-order moment about the Y-axis strongly depends on the thickness. Therefore, because the thickness gradually increases from thedistal end 3 d toward thebase 3 c, a portion that is closer to thebase 3 c than thefirst bending position 3 a is stably endures the bending moment generated by the pressing force Fl when the pressing force F1 acts on thedistal end 3 d. Similarly, a portion that is closer to thebase 3 c than thesecond bending position 3 b is stably endures the bending moment generated by the pressing force F2 when the pressing force F2 acts in the vicinity of the base of thefirst bending position 3 a. By doing so, it is possible to reliably bend theneedle portion 3 only at thefirst bending position 3 a and thesecond bending position 3 b, and thus, there is an advantage in that it is possible to further stabilize the bent shape of theneedle portion 3. - The
needle portion 3 possesses characteristics that make it difficult to cause bending deformation about the X-axis. Therefore, for example, even if bending moment about the X-axis acts on theneedle portion 3 in such a way that theneedle portion 3 is pushed out from theslot 6 in a slightly slanted manner instead of perpendicular to theinner surface 5 a of theanvil 5 or the like, theneedle portion 3 stably endures the bending moment about the X-axis, and thus, the bending deformation thereof is selectively caused only about the Y-axis. By doing so, there is an advantage in that it is possible to further stabilize the bent shape of theneedle portion 3. - At the
first bending position 3 a and thesecond bending position 3 b, it is possible to cause bending deformation by means of smaller amounts of forces as compared with other portions of theneedle portion 3. Thus, after thefirst bending position 3 a and thesecond bending position 3 b have yielded once, it is also possible to make the amounts of forces required to cause additional bending deformation at thefirst bending position 3 a and thesecond bending position 3 b small, as shown inFIG. 4D . Therefore, there is an advantage in that it is possible to cause bending deformation in theneedle portion 3 by means of a small amount of force throughout the bending deformation process. - The width of the
needle portion 3 is constant from thebase 3 c to thefirst bending position 3 a, the thickness of theneedle portion 3 is smaller at thesecond bending position 3 b than it is at thebase 3 c, and the thickness is smaller at thefirst bending position 3 a than it is at thesecond bending position 3 b. By forming theneedle portion 3 in such a shape, processing and manufacturing of theneedle portion 3 are facilitated. Because the widths by which thecurved portion 3B and theinner surface 5 a of theanvil 5 come into contact with each other are constant, there is an advantage in that the shape of the anvil pocket is simplified and that it is possible to stably deform theneedle portion 3. - In this embodiment, although the
medical staple 1 has been assumed to have asingle needle portion 3, alternatively, themedical staple 1 may be provided with two ormore needle portions 3, as shown inFIGS. 5A, 5B, and 5C . - The
medical staple 1 shown inFIGS. 5A, 5B, and 5C is provided with twoneedle portions 3. Theneedle portions 3 protrude from two positions at one end of thebase portion 2 with a space therebetween in the width direction, and extend so as to be parallel to each other. - As shown in
FIG. 6A , the twoneedle portions 3 may be provided at both ends of thebase portion 2. In this case, the twoneedle portions 3 protrude from both ends of thebase portion 2 in opposing directions from each other in the longitudinal direction of thebase portion 2, and are curved in the same direction with respect to thebase portion 2. As shown inFIG. 6B , it is possible to cause bending deformation in theneedle portion 3 having such a shape, by using, for example, an anvil in which theinner surface 5 a thereof has a shape such as that shown inFIG. 6A . - In this embodiment, although the
needle portion 3 is assumed to have a shape in which the width and the thickness thereof continuously change from thedistal end 3 d to thebase 3 c, alternatively, theneedle portion 3 may have a shape in which the width and the thickness thereof change in a step-wise manner, as shown inFIGS. 7 and 8 . - Doing so facilitates designing the cross-sectional second-order moments Ix and Iy for the respective positions of the
needle portion 3, and thus, it is possible to easily design a shape of theneedle portion 3 such that thefirst bending position 3 a and thesecond bending position 3 b first yield to the pressing forces F1 and F2, respectively. -
- 1 medical staple
- 2 base portion
- 3 needle portion
- 3A distal-end portion
- 3B curved portion
- 3 a first bending position
- 3 b second bending position
- 3 c base
- 3 d distal end
Claims (6)
1. A medical staple comprising:
a rectangular base portion; and
a needle portion that extends from one end of the base portion in a substantially arc shape so as to protrude in a predetermined direction with respect to the base portion,
wherein the needle portion has
a first bending position that is provided between a base connected at the one end and a distal end, and that yields first when a pressing force in a radially inward direction of a substantially arc shape of the needle portion acts on the distal end, and
a second bending position that is provided between the first bending position and the base, and that yields first when the pressing force acts in the vicinity of the base of the first bending position.
2. A medical staple according to claim 1 , wherein, at the first bending position and the second bending position of the needle portion, a cross-sectional second-order moment about an axis in a direction perpendicular to a plane defined by the base portion and the needle portion is equal to or less than a cross-sectional second-order moment about an axis in another direction.
3. A medical staple according to claim 1 , wherein an outer-circumferential surface of the needle portion has a constant curvature.
4. A medical staple according to claim 1 , wherein a cross-sectional area of the needle portion is greater at the second bending position than at the first bending position, and the cross-sectional area is greater at the base than at the second bending position.
5. A medical staple according to claim 4 ,
wherein a width of the needle portion is constant between the first bending position and the base,
a thickness of the needle portion is smaller at the second bending position than at the base, and the thickness is smaller at the first bending position than at the second bending position.
6. A medical staple according to claim 1 ,
wherein the needle portion has a distal-end portion formed of a portion between the distal end and the first bending position,
the cross-sectional area of the needle portion is smaller at the distal-end portion than at a portion between the first bending position and the base, and
a size of the needle portion is smaller in the distal-end portion than in a portion between the second bending position and the base.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2014/079732 WO2016075740A1 (en) | 2014-11-10 | 2014-11-10 | Medical staple |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2014/079732 Continuation WO2016075740A1 (en) | 2014-11-10 | 2014-11-10 | Medical staple |
Publications (1)
Publication Number | Publication Date |
---|---|
US20170296175A1 true US20170296175A1 (en) | 2017-10-19 |
Family
ID=55953853
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/588,046 Abandoned US20170296175A1 (en) | 2014-11-10 | 2017-05-05 | Medical staple |
Country Status (3)
Country | Link |
---|---|
US (1) | US20170296175A1 (en) |
JP (1) | JPWO2016075740A1 (en) |
WO (1) | WO2016075740A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10881400B2 (en) | 2016-11-18 | 2021-01-05 | Olympus Corporation | Medical stapler system |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080078807A1 (en) * | 2006-09-29 | 2008-04-03 | Hess Christopher J | Connected surgical staples and stapling instruments for deploying the same |
US20140175153A1 (en) * | 2010-05-27 | 2014-06-26 | Cardica, Inc. | Barbed surgical staple |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SU982676A1 (en) * | 1981-04-07 | 1982-12-23 | Всесоюзный научно-исследовательский и испытательный институт медицинской техники | Surgical cramp |
DE4014653A1 (en) * | 1990-05-08 | 1991-11-14 | Beiersdorf Ag | SURGICAL CLAMP |
JP2672713B2 (en) * | 1993-03-02 | 1997-11-05 | ホロビーム インコーポレイティド | Surgical equipment |
JPH09224944A (en) * | 1996-02-26 | 1997-09-02 | Olympus Optical Co Ltd | Suturing/ligating tool |
US20040267310A1 (en) * | 2000-10-20 | 2004-12-30 | Racenet David C | Directionally biased staple and anvil assembly for forming the staple |
-
2014
- 2014-11-10 WO PCT/JP2014/079732 patent/WO2016075740A1/en active Application Filing
- 2014-11-10 JP JP2016558459A patent/JPWO2016075740A1/en active Pending
-
2017
- 2017-05-05 US US15/588,046 patent/US20170296175A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080078807A1 (en) * | 2006-09-29 | 2008-04-03 | Hess Christopher J | Connected surgical staples and stapling instruments for deploying the same |
US20140175153A1 (en) * | 2010-05-27 | 2014-06-26 | Cardica, Inc. | Barbed surgical staple |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10881400B2 (en) | 2016-11-18 | 2021-01-05 | Olympus Corporation | Medical stapler system |
Also Published As
Publication number | Publication date |
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WO2016075740A1 (en) | 2016-05-19 |
JPWO2016075740A1 (en) | 2017-08-24 |
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